Too many resources have shown the rod length to be 5.9" for both motors. We have known for a long time that the 3900 LZ9 rod is 5.827" long from measurements, but the LZ4 was kind of a mystery even now in 2023. Maybe its out there, but most people want to build the bigger motor. However, there is something more to these motors than to think of them like bigger 2.8/3.1 motors. Unlike the 2.8 and 3.1, the difference is the stroke and rod, not stroke and pistons.
Having both...
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by SappySE107Too many resources have shown the rod length to be 5.9" for both motors. We have known for a long time that the 3900 LZ9 rod is 5.827" long from measurements, but the LZ4 was kind of a mystery even now in 2023. Maybe its out there, but most people want to build the bigger motor. However, there is something more to these motors than to think of them like bigger 2.8/3.1 motors. Unlike the 2.8 and 3.1, the difference is the stroke and rod, not stroke and pistons.
Having both...05-27-2023, 06:52 AM -
by bszopiMechanical specifications and fastener tightening specifications for the 3900 engine....09-29-2010, 08:27 PM